This is a n-body code that simulates the Newtonian gravity equations.
This project uses cmake in order to generate any type of projects (Makefile,
Visual Studio projects, Eclipse projects, etc.).
On Linux/Debian-like systems:
sudo apt-get install cmakeMUrB depends on some other Git repositories (or submodules). It is highly
recommended to get those submodules before trying to do anything else. Here is
the command to get all the required submodules:
git submodule update --init --recursiveMUrB comes with a cool real time display engine. To enjoy it, you have to
install some dependencies: OpenGL >= 3.0, GLEW >= 1.11.0, GLM >= 0.9.5.4
and GLFW >= 3.0.4 libraries are required. If one on these libraries is missing
on your system, then MUrB will be compiled in console mode only.
On Ubuntu 20.04 you can install the required libraries as follow:
sudo apt install libglfw3-dev libglew-dev libglm-devOpen a terminal and type (from the MUrB root folder):
mkdir build
cd build
cmake .. -G"Unix Makefiles" -DCMAKE_CXX_COMPILER=g++ -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_CXX_FLAGS_RELWITHDEBINFO="-O3 -g" -DCMAKE_CXX_FLAGS="-Wall -funroll-loops -march=native"
make -j4Run 1000 bodies (-n) during 1000 iterations (-i) and enable the verbose mode
(-v):
./bin/murb -n 1000 -i 1000 -vExpected output:
n-body simulation configuration:
--------------------------------
-> bodies scheme (-s ): galaxy
-> implementation (--im ): cpu+naive
-> nb. of bodies (-n ): 1000
-> nb. of iterations (-i ): 1000
-> verbose mode (-v ): enable
-> precision : fp32
-> mem. allocated : 0.0724792 MB
-> geometry shader (--ngs ): enable
-> time step (--dt ): 3600.000000 sec
-> softening factor (--soft): 2e+08
Compiling shader: ../src/common/ogl/shaders/vertex330_color_v2.glsl
Compiling shader: ../src/common/ogl/shaders/geometry330_color_v2.glsl
Compiling shader: ../src/common/ogl/shaders/fragment330_color_v2.glsl
Linking shader program... SUCCESS !
Simulation started...
Iteration n°1000 ( 729.9 FPS), physic time: 41d 16h 0m 0.000s
Simulation ended.
Entire simulation took 1370.0 ms (729.9 FPS)
Here is the help (-h) of MUrB:
Usage: ./bin/murb -i nIterations -n nBodies [--dt timeStep] [--gf] [--help] [--im ImplTag] [--ngs] [--nv] [--nvc] [--soft softeningFactor] [--wg workGroup] [--wh winHeight] [--ww winWidth] [-h] [-s Bodies scheme] [-v]
-i the number of iterations to compute.
-n the number of generated bodies.
--dt select a fixed time step in second (default is 3600.000000 sec).
--gf display the number of GFlop/s.
--help display this help.
--im code implementation tag:
- "cpu+naive"
----
--ngs disable geometry shader for visu (slower but it should work with old GPUs).
--nv no visualization (disable visu).
--nvc visualization without colors.
--soft softening factor.
--wh the height of the window in pixel (default is 768).
--ww the width of the window in pixel (default is 1024).
-h display this help.
-s bodies scheme (initial conditions can be "galaxy" or "random").
-v enable verbose mode.